Guard for punch presses



May 29,1928. 1,671,901 E. ISCHINGER.

GUARD FOR PUNCH PRESSES Filed May 2, 1924 5 Sheets-Sheet l --llll\HVENTOR May 29, 1928.

Filed May 2, 1924 s Sheets-Sheet 2 INVENTOR May 29, 1928.

E. ISCHINGER GUARD FOR PUNCH PRESSES 3 Sheets-Sheet 5 Filed May 2, 1924R O T H E v N Patented May 29, 1928.

UNITED STATES PATENT OFFICE.

ERIC ISCHINGER, OF EAST ROCHESTER, NEW YORK, ASSTGNOR OF ONE-HALF 'i'COFRANK KEIPEP OF ROCHESTER, NEW YORK.

GUARD FOR PUNCH PRESSES.

Application filed May 2, 1924. Serial No. 710,628.

T he object of this invention is to provide a new and improved type ofguard for punch presses or similar machines.

Another object of this invention is tovso a construct and operate theguard that it will guard the danger point of the machine immediatelyafter the machine begins to operate. v

These and other objects of this invention P will be fully illustrated inthe drawings, de-

scribed in the specification and pointed out in the claims at the endthereof.

In the accompanying drawings: Figure l is a perspective view of a punchpress with the guard attached thereto.

Figure 2 is a detail'perspective view of a modified form of theoscillating member of the guard.

Figure 3 is a perspective View of a modilied guard member operated bythe guard.

Figure a is a detail perspective View of another modified guard memberoperated by the guard.

Figure 5 is a perspective View of a: punch press with a modified form ofthe guard attached thereto.

Figure 6 is a detail perspective view of a modified form of the guardmember for the guard illustrated in Figure 4.

Figure 7 is a detail perspective view of the punch press with anothermodified form of the guard attached thereto.

Figure 8 is detail perspective view of a modified form of theoscillating member of the guard. v V I In the several figures of thedrawings like reference numeralsindicate like parts.

The guard for punch presses orother similar machines forming the subjectmatadapted for use on presses in which the sweeping motion of a pendulumguard in front of the ram of the press is objectionable due to thenature of the work that is to be performed by the press.

As illustrated in the figures of the drawings the arm of the guardinstead of swing ingacross in front of the ram of the press swings atone" side thereof, that is, instead of swinging in front of the operatoracross from one side to the other it swingstoward and away from theoperator. For this reason the oscillating member 1 of the guard ismounted to oscillate on a stud 2 that is mounted parallel to thevface ofthe press and ilk ter of my present invention is especially suitablysupported on the frame by the bracket The oscillating member 1 isprovided with the sleeves 5 and -6 of which sleeve 6 is threaded toreceive the threaded arm 7.

This arm has an eye 8 formed on the end arm 12 is adjustably mounted abracket 13 in which a horizontal guard member 13 is adjustably carried.This guard member is normally held in place by the guard arm at a pointbetween the bottom of the ram 11 and the bed plate let of the press andslightly behind the punch 15 and die 15 mounted on the press. .On thedownward movement of the ram the oscillating member 1 is oscillated asabove pointed out and swings the lower. end, ofthe guard arm 12 and withit the guard member 13 outwardly, moving the guard through between thepunch and die before the ram. brings the punch and the die together. Theoperators fingers are thus forced back from the die if they are in placeon the die where the punch would pincht-hem or cut them oil when thepunch and die are finally brought together. I

In this way the guard member 13* is automatically made to sweep over thedie at every strokeofthe ram of the press and brushes the fingers ofthe; operator away from the top of the die should they acci dentally bein place thereon when the rain of the press begins to descend to bringthe punch and die together. U r

The guard member 1'3 illustrated in Figure 1 comprises a fiber or othernon-metallic rod having its upper face tapered into a triangular crosssection. This serves to de tlect the guard member to either the front orthe back should the punch come in contact with the tapered sides of theguard member.- This may happen if the guard is not properly adjusted sothat the guard memberdoes not IHQYQ OUt' from under the punch before thepunch and die is closed.

In Figures 3 and 4 modifications of the guard member are illustrated.The modification of the guard member comprises a bar having a crosssection identical to that of the cross section of the guard member 13described in connection with Figure 1. Instead of being straight howeverthis guard member is bent into a V with the apex of the V located closeto the back of the die over which it is adapted to sweep. This bringspart of the guard member in very close proximity to the die that itguards, withoutobstructing free access to the die from either side orthe front thereof.

' The modified form. of the guard member illustrated in Figure 4; isnotintended to pass over the die. It is made up of the bar 16 carried onthe lower end of the guard arm 12 and the auxiliary guard members orfeelers 17 and 18 are adjustably mounted on the bar 16 and projectforwardly therefrom. The guard is adjusted so that the guard arms swingsthe bar 16 toward or away from the back of the die without moving overit while the auxiliary guard members or feelers move alongside the die.In front the feelers may be curved and bent to either 'flare inwardly oroutwardlly depending on the stock and the operation on the stock that isto be performed by the press.

In the operation of this guard it is desirable to make the guard armswing at a variable speed. For this purpose the modification of theoscillating member illustrated in Figure 2 may be used. In thismodification the threaded arm 7 illustrated in Figure 1 is replaced bythe adjustable yoke 20. This yoke has threaded ends that are adapted topass through a pair of suitable sleeves formed in the oscillating memberabove and below the bearing of the oscillating member. Suitable locknutsare employed to clamp the ends of the yoke in place on the oscillatingmember. The yoke thus forms a slotted arm for the oscillating member inwhich a roller 21 is adapted to slide back and forth. The connectinglink 9 is attached to this roller and the guard 13 so adjusted that theyoke in its normal position assumes a position in which the roller 21 islocated close to the oscillating member. The downward movement of theconnecting link then rocks the oscillating member quickly at thebeginning of the stroke of the ram because of the close proximity of theroller to the center of oscillation of the oscillating member. Duringthe oscillation of the oscillating member the roller gradually moves outin the slotted arm formed by the yoke and thus gradually reduces thespeed of the guard arm. On the return movement the guard moves slow atfirst and gradually speeds up until it reaches its starting position. I

provided with the laterally projecting arm or lug 25 while the section23 is provided with the upwardly projectinglug 26. The action of thecoiled spring 2-tholds the end of the lug or arm 25 in contact with thelug 26 so that on the reciprocation of the ram the two sections areoperated in unison unless the guard member or guard arm isprevented fromswinging as above pointed out. In that case the section 22 which isdirectly connected to the ram of the press thru the connecting link canoscillate alone because of the yielding connection between the twosections that is formed by the coiled spring 24.

The modification of the guard illustrated in Figure 5 differs from thatillustrated'in Figure 1 in the operating connection between theoscillating member end and a movable part of the press. This connectionis made between the connecting rod 27 of the press and the oscillatingmember instead of the ram 11 of the press and the oscillating mem ber asillustrated in Figure 1. A block 28 is clamped to the curved front ofthe connecting rod by means of the clamping screw 29 which passes thruthe middle of the block 28 and is threaded into the connecting rod andforces the V shaped'seatprovided at the back of the block 28 against theface of the connecting rod.

At the left of the block 28 is provided a boss 30 into which the arm 31is threaded. The bearing sleeve 32 carried on the upper end of the link33 is adapted to oscillate on the outer end of the arm 31 completing theconnection between the adjustable arm of the oscillating member 1 andthe connecting rod of the press. The connection between the connectingrod and the oscillating member operates the guard in the same manner asthe connection between the oscillating member and the ram of the pressillustrated in Figure 1 except that in the connection between theconnecting rod and the guard the parts may be adjusted permanently forall work due to the uniformity of the movement and position of theconnecting rod while when connecting the ram of the press with theoscillating member, the connection must be adjusted whenever the ram isadjusted by raising it or lowering it on the end of the connecting rod.

In Figure 5 the guard member operated by the guard arm comprises aswinging plate lot 3,5 that is mounted to swing on the base of the die.The swinging plate is therefore provided with a suitable hinge leaf 36that is fastened to the base of the die. A pin 37 is provided on theplate 35 and projects to the left thereof to engage into the slot38provided in the end of the guard arm 12. On the operation of the pressthe swinging of the guard arm operates to swing the swinging plate froma position below the ram of the press to a position on the outsidethereof which movnent of course'must be quick enough so that theswinging plate will have passed from under the ram before the ram hasdescended too far to prevent the swinging of the plate. The plateslotted in the middle so that the punch carried by the ram can descendwithout obstructing the movement of the swinging plate. The funetion ofthis guard member is to force back the hand or the fingers of theoperator feeding the press as soon as the ram descends. It will ofcourse be understood that the plate may be formed, thatis slotted andbent in any suitable manner to conform to the construction and operationof the die that it is to guard.

In Figure 6 the swinging plate is mounted on the end of the ram of thepress and is also made to swing out from under the arm as the ramdescends.

In Figure 7 another modified form of the guard member is illustrated.This form of the guard member comprises a swinging gate 40 that swingsfrom one side of the'ram to the front of the ram and is mounted on thevertical pivot stud 41. The pivot stud 41 is anchored on the base of thedie. The gate 40 is curved or semicircular in outline and is adapted toencircle the front and sides of the die when it swings into its guardingposition. Projecting from the side of the swinging gate is a cam plate42 having the cam slot 43 provided therein. The lower end of the guardarm engages into this cam slot so that when the guard arm swings outwardon the descent of the ram of the press the lower end thereof slides inthe cam slot and swings the gate from a position at one side of the dieto a position in front of it. This brushes the hand of the operator toone side should it be still in place on the die when the press begins tooperate.

From the foregoing it will be seen that while the guard member of theguards illustrated in the figures differ both in design and operation,the actual operating mechanism of the guard remains the same andoperates to automatically throw or brush the hands or fingers of theoperator away from the die immediately after the ram of the press isreleased and descends to bring the punch in engagement with the die, andthus prevents serious injury to the fingers or the hand of the operator.

I claim: 7

I. In a. guard for punch presses, the combination of an oscillatingmember, an operating arm and a guard arm carried by said oscillatingmember, a yielding connection between said operating arm and said guardarm to allow said guard arm to yield on the oscillation of saidoperating arm when encountering a resistance greater than that offeredby the hand or arm of the operator in. operating the press.

In a guard for punch presses, the combination of an oscillating member,divided into'two sections, a, yielding connecting memberbetween said twosections, an operating arm carried by one of said sections and a guardarm carried by the other of said sec tions, said yielding connectionbeing adapted to allow said. guard arm to yield on the oscillation ofsaid oscillating member when encountering a resistance greater thanvthat offered by the hand or arm of the operator inoperating the press.

3. In a guard for punch presses, the combination of an oscillatingmember, an operating arm and a guard arm carried by said oscillatingmember, a yielding connection between saiid operating arm and said guardarm to allow said guard arm to yield on the oscillation of saidoperating arm when encountering a resistance greater than that offeredby the hand or arm of the operator in operating the press, meansprovided on said oscillating member to hold said operating arm and saidguard arm in a predetermined initial position.

i. In a guard for punch presses, the combination of an oscillatingmember comprising two sections, one of said sections carrying anoperating arm the other of said sections carrying a guard arm, atorsional member connecting said two sections, means car ried by each ofsaid sections to prevent their independent oscillation in one direction,said torsional member being adapted to yield on the retardation of saidguard arm when encountering a resistance greater than that offered bythe hand or arm of the operator in operating the press.

5. In a guard for punch presses having a frame and a movable membermounted in said frame, the combination of an oscillating member mountedon the frame, a con necting link connecting said oscillating member withthe movable member of the press, a guard arm carried by said oscillatingmember, a laterally extending guard member attached to said guard armand held in position in back of the movable member of the press, aforwardly projecting auxiliary guard member carried by said laterallyextending guard member, said oscillating member swinging said guard armtoward and away from the frame of the press with said laterallyextending guard member moving lUt) lit)

toward and away from the movable member of the press and with saidforwardly projecting auxiliary guard member moving on one side of themovable member of the press.

6. In a guard for punch presses having a frame and a reciprocating rammounted in the frame, the combination of an oscillating member mountedin front of the frame, a connecting link connecting said oscillatingmember with the ram of the press, a guard arm carried by saidoscillating member and located on one side of the reciprocating ram, apair of forwardly projecting auxiliary guard members carried by saidguard arm and adapted to be moved back and forth on each side of the ramon the oscillation of said oscillating member and the movement of saidguard arm caused thereby and means for adjusting one of said pair offorwardly projecting auxiliary guard members toward and away from theother of said pair of forwardly projecting auxiliary guard members.

reciprocating ram, a guard arm carried by said oscillating member andlocated on one side of the reciprocating ram, a laterally extendingguard member attached to said guard arm, a forwardly and outwardlyprojecting auxiliary guard member carried by said laterally extendingguard member and means for adjusting said auxiliary guard member toproject to the front of the ram of the press, said oscillating memberswinging said laterally extending guard member toward and away from theram of the press and said forwardly and outwardly projecting auxiliaryguard member on one side and in front of the ram of the press.

In testimony whereof I my signature ERIC ISCHINGER.

